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The article discusses development of the backfill composition based on OTDV «Mikrodur». A method of mathematical planning of the experiment is described used to prove the optimal formulation of water isolation composition and the processing of the study results by application of the procedure of “full factorial experiment”. The results of the study by computer microtomography of the formed plugging stone are also presented.

The article presents the methodical aspects of diagnostics of wells drowning causes on the example of well No.106, Povkhovskoye oil field (layer BV8), based on determination of major geological and technological factors of risk of well drowning occurrence and on the graphical analysis of the well performance for a specified period of time.

The article analyzes the basic geological and engineering factors of risk which must be taken into account before implementing the repair-isolation operations in oil and gas wells as well as graphical diagnostics of water cut development on the example of wells in the field Povhovskoye. The field-geophysical methods and actuality of hydrodynamic modeling are also discussed.